Fuzzy Search

ELI5 — The Vibe Check

Fuzzy search finds results even when the search term is misspelled or slightly off. Search for 'jonh' and it still finds 'John.' It uses algorithms that measure how similar two strings are. Perfect for search bars where users can't spell.

Real Talk

Fuzzy search finds approximate matches rather than exact matches, using string similarity algorithms like Levenshtein distance, Jaro-Winkler, or trigram similarity. In PostgreSQL, the pg_trgm extension enables trigram-based fuzzy search with GIN/GiST indexes. Elasticsearch provides fuzzy queries with configurable edit distance. Essential for user-facing search with typo tolerance.

Show Me The Code

-- PostgreSQL with pg_trgm
CREATE EXTENSION pg_trgm;

SELECT name, similarity(name, 'jonh') as sim
FROM users
WHERE name % 'jonh'  -- trigram similarity > threshold
ORDER BY sim DESC;

When You'll Hear This

"Enable fuzzy search so typos like 'iphne' still find 'iPhone'." / "We use pg_trgm for fuzzy search instead of Elasticsearch — simpler for our scale."